1986 Nissan 300zx wont start after shutting it off

I have to jump start my 1986 300zx everytime and as soon as I turn it off it wont start again, it runs perfect after jump starting. I have changed the battery twice first I bought a used and then a new andbit still does the same, I also bought a new alternator recently and still does the same. please help

I recently acquired a 1986 Nissan 300zx, which I had to learn manual in order to drive-- I got it for 300 bucks
from a friend, it's not in the best condition but it's been driving. However yesterday ...

I have a 1986 Nissan 300zx that it wont accelerate when I press the gas, sometimes it will work but when it does not it will take like 20 seconds to go.. is like it losses power... after that it will...

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